<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert
        title="注意:只允许为第三级分类设置参数"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <span style="margin-right: 15px">选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectparamsKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisbled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="valueMany" border stripe>
            <!-- 动态展开行 -->
            <el-table-column type="expand">
              <!-- 用自定义插槽来接收数据 -->
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handlClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <!-- 参数名称列 -->
            <el-table-column
              prop="attr_name"
              label="参数名称"
            ></el-table-column>
            <!-- 操作 -->
            <el-table-column label="操作">
              <!-- 运用作用域插槽接收数据 -->
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >修改</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="deleteParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisbled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="valueOnly" border stripe>

            <!-- 静态展开行 -->
            <el-table-column type="expand">
              <!-- 用自定义插槽来接收数据 -->
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handlClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <!-- 属性名称列 -->
            <el-table-column
              prop="attr_name"
              label="参数名称"
            ></el-table-column>
            <!-- 操作 -->
            <el-table-column label="操作">
              <!-- 运用作用域插槽接收数据 -->
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >修改</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="deleteParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改参数表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有的商品数据
      catelist: [],
      // 级联选择框配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择框双向绑定到的数组
      selectparamsKeys: [],

      // 被激活的页签名称
      activeName: "many",

      // 动态参数数据
      valueMany: [],

      // 静态参数数据
      valueOnly: [],

      // 参数对话框的显示与隐藏
      addDialogVisible: false,

      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },

      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },

      // 控制修改对话框的显示和隐藏
      editDialogVisible: false,

      // 修改表单的数据对象
      editForm: {},

      // 修改表单的数据验证对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },

  created() {
    this.getCateList();
  },

  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品列表失败");
      } else {
        this.catelist = res.data;
        // console.log(this.catelist);
      }
    },

    // 级联选择框选中项变化会触发这个函数
    handleChange() {
      this.getParamsData();
    },

    // tab 页签点击事件处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },

    // 获取参数的列表数据
    async getParamsData() {
      // console.log(this.selectparamsKeys);
      if(this.selectparamsKeys.length !== 3){
        this.selectparamsKeys = []
        this.valueMany = []
        this.valueOnly = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectparamsKeys);
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      } else {
        // console.log(res.data);
        // 拿到每一项的数据
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
          // 控制文本框的显示与隐藏
          item.inputVisible = false;
          // 文本框中输入的值
          item.inputValue = "";
        });
        console.log(res.data);

        if (this.activeName === "many") {
          // 挂载到动态参数表格
          this.valueMany = res.data;
          // console.log(this.valueMany);
        } else {
          // 挂载到静态属性表格
          this.valueOnly = res.data;
          // console.log(this.valueOnly);
        }
      }
    },

    // 添加对话框的关闭事件
    addDialogClosed() {
      // 重置
      this.$refs.addFormRef.resetFields();
    },

    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        // 发起请求
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败");
        } else {
          this.$message.success("添加分类成功");
          // 隐藏参数对话框
          this.addDialogVisible = false;
          // 刷新页面
          this.getParamsData();
        }
      });
    },

    // 点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      // 查看当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败");
      } else {
        // this.$message.success("获取参数信息成功");
        this.editForm = res.data;
        console.log(this.editForm);
      }

      this.editDialogVisible = true;
    },

    // 关闭修改对话框时关闭事件
    editDialogClosed() {
      // 重置修改表单
      this.$refs.editFormRef.resetFields();
    },

    //点击按钮修改参数信息
    editParams() {
      // 验证
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        // 校验成功
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("参数修改失败");
        } else {
          this.$message.success("修改参数成功");
          // 刷新列表
          this.getParamsData();
          // 隐藏参数对话框
          this.editDialogVisible = false;
        }
      });
    },

    // 根据id删除参数
    async deleteParams(id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      // 用户取消了删除操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      } else {
        // 删除业务逻辑
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${id}`
        );
        if (res.meta.status !== 200) {
          return this.$message.error("参数删除失败");
        } else {
          this.$message.success("参数删除成功");
          this.getParamsData();
        }
      }
    },

    // 文本失去焦点或按下回车触发的事件
    handleInputConfirm(row) {
      // 文本框清空
      // trim() 用于删除字符串的首尾空白符
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        // 文本框隐藏，显示按钮
        row.inputVisible = false;
        return;
      } else {
        // 通过输入文本框中的值，添加到attr-vals中
        row.attr_vals.push(row.inputValue.trim());
        row.inputValue = "";
        row.inputVisible = false;
      }
      // 发起请求保存这次操作
      this.saveAttrVals(row)
    },

    // 按下按钮切换input
    showInput(row) {
      row.inputVisible = true;
      // 文本框自动获取焦点
      // $nextTick  方法的作用，就是当页面上的元素重新渲染之后，才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },

    // 定义一个函数保存修改参数的请求
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "), //将数组中的所有元素转换为字符串
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数失败");
      } else {
        this.$message.success("修改参数成功");
      }
    },

    // 删除参数
    handlClose(i, row) {
      // splice() 方法用于添加或删除数组中的元素。
      row.attr_vals.splice(i, 1)
      // 发起请求保存这次操作
      this.saveAttrVals(row)
    },
  },

  computed: {
    // 如果按钮需要被禁用，则返回true, 否则返回false
    isBtnDisbled() {
      if (this.selectparamsKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectparamsKeys.length === 3) {
        return this.selectparamsKeys[2];
      } else {
        return null;
      }
    },

    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 150px;
}
</style>